Drafting instrument.



R. B. ALLYN.

DRAFTING INSTRUMENT.

APPLICATION min :uns 1e. 1915.

1,156.512. Patented 0015.121915.

y ments.

The primary object of `this invention is the rprovision of a combined sealeand tri-` i appended claims.

. RUrUsnfALLYn, OF COLORADO SPRINGS, COLORADO;

T 0 all whom t may concern `Be it known thatLRUFUs B. AnLYma citizen of the United States, `residing "at Colorado Springs, in the ,county of `El ,Paso` and State of Colorado, haveinvented certain 'new and useful Improvements in Drafting Instruments, of which the following is a specification. f

This invention relates to certain neWf and f useful improvements L in drafting instruangle removably assembled -whereby the scale may be employed alone or for denoting edge graduationsivhen combined with the triangle. y

A further object ofy the sired graduations and being insertible in a viewable position Within any straight edge of an instrument formed for the removable reception thereof.

A still further object of theinvention is to provide a transparent straight edge drawing instrument arranged for the removable re-r ception of a graduated scale and ywhereby the instrument may be used as a scale,it being understood that as many straight 'edge sides thereof may be so provided as desired, While a pencil point releasable engaging means for temporary vided for the scale.

With these generaly objects in view and others that will appear as the nature of the invention is better understood, the same consists in the` novel construction, combination and arrangement of parts hereinafter more fully described, illustrated in the accompanying drawings, and pointed out in the 1n the drawings forming appartk oflthis application and 'in which like designating characters refer to corresponding parts throughout the several vieWsz-Figure 1 is an elevational View of 'a triangle provided with a scale arrangedftherein as now de-A vised, the scale being illustrated in' dotted lines. Fig. 2 `a perspective vieiv'of the scale employedfvviththe'device;, Fig. 3 is an enlarged sectional detail vievv taken upon line IIIe-111 ofF ig. 1. Fig. d' is a sectional view similar to Fig. 3 but with thek `s'caleremoved, and, Figi 5 is an enlarged perspec`- v Specification of Letters Patent. i

appiicatibnmea June 16,1915. semaines/1,421.

n invention yis the provision of a scalel provided with any def" securement is prof nnnnriive insrrwivrnnm.

Patented oet; ia, i915.

tive vieivofa corner portion of the triangle with thescale removed.

The present devicewill benow described in connection with a triangle 10 of the usual j form, the invention being arranged solely at the-longer leg of the triangle and the edge 11 thereof although it is to be understood that the'invention isfsimilarly applicable to any straight edge drawing instrument and maybe utilized foreach edgeof a triangle if so desired.

y A scale 12 is employed having any desired graduationsf 13 thereon Which may be required for engineers, architects or any vocation With `which the instrument is desired for use rllhe said scale 12 as Well as the triangle 10ivith which it is employed are prefcrably formed of transparent material, such asvpyroxylin. @ne end of the scale 14 at the v beginning of the graduations thereof is slightly kroimdedi and is also inclined; away from its operating edge 15 While the opposite end 16 thereof is similarly inclined, thus making the opposite ends of the scale paral- Vlel to each other, the scale as an entirety" being in the form of a rhomboid. The edge 11 of the triangle is provided" with a centrally-positioned receiving slot 17 forming a socket and adapted for the removable reception of the scale 12, the said socket being provided with oblique parallel end 4Walls 18 substantially conforming to the scale ends 14 and 16,`the said socket being of slightly greater length than the scale so as to allow` the ready insertionand removal of the scale.

The triangle 10 is provided with an 'ovalshaped perforation 19 in one face thereof and commnnicating with the edge socket .17',y

adjacent the bottom 20 of the said socket and ata point slightly removed from "one end thereof.y The Wallof the socket 17 opposite the perforation 19 is providedgwith a hump or projection 21 While the inner klongi-y tudinal end 22 of the perforation 19 is inivardly beveled from the face of the triangle at which the perforation opens to the face of the socket 17 which isy provided with a hump 2,1.

With the scale 12 operatively positioned* inthe socket 17 of the triangle 10 as best illustrated in'Fig. 1, it will be evident that the graduations of the `scalermay be readilyr discerned from either side of the triangle and that the edge l1 may be kthus employed as a scale, the graduated edge of the `scale 12 lying flush with the ruling edge 11 of the triangle. The obliqueend 16 of the scale is slightly retained in contact with the similarly inclined i en'd 18 of the `receiving socket 17 by means of a'recess 23 formed on one side of the scale 12 and adjacent the end 141-` thereof, which-recess is received over the projection 21 wheny the scale is forciblyy moved to its seated position within the socket 17 and with the scale end 14 substanv tially in contact with the adjacent end 18 of scale suficiently out of the socket 17 to allow y the operator to engage the scale end 14 and then completely remove the scale fromthe triangle.

It will thus be evident that a serviceable Ldrafting vinstrument is provided and one that is inexpensive and easy to manufacture although being eflicientin its use for accomplishing they desired objects.

While the form of the invention herein set forth is the preferred embodiment thereof, it will be understood that certain changes andalterations may be made therein with-y out departing from the present invention, such for instance, as the employment of; a non-transparent scaleV Y having graduations upon its opposite edges and therefore reading in opposite directionsand viewable from the opposite sides of the triangle, while a non-transparent triangle may be employed having the graduations formed `directly upon the operative edge ofthe scale and thereby viewable centrally of the operative edge ofthe triangle.

What I claim asnew isz- 1. A drafting triangle having a centrallypositioned edge socket provided with parallel .oblique ends and having an ovalsshaped perforation communicating between one face of the triangle and a point adjacent f the bottom of the said' socket, a projection within the said, socket upon the wall thereof j ing means for a releasing member adjacent oppositey the said yperforation and being in alinement with the said perforation, the said perforationhaving its inner edge inclined to a point adjacent the bottom of the socket at the inner edge of the said opposite wall thereof, Vthe said scale being provided with a recess adjacent one end thereof and remov-v ably positioned over the said projection rin vpresence of two when the scale is seated within thevsaid socket with the ends of the scale lying in parallelism with the ends .ofVv the socket.

2. A drafting instrument formed of transparent material provided rwith a longitudinal slot socket yin its operative straight edge, the ends walls of the said socket being arranged obliquely with respect to said straight edge and in parallelism, and a rhomboi'dalshaped Iscale member Vremovably retained within the said socket.

3. A transparent drafting instrument hav-v ing a. slot socket in the operative straight edgethereof, the opposite ends of the said socket being inclined and parallel to each other, a graduated scale positionable withinA thesaidsocket and substantially conform-r ing tothe configuration thereof, and disengageable connections between the said scale and instrument.,v

4. A device of the class described, com- `prising a transparent drafting instrument having a receiving slotrsocket in the edge thereof andhavinga side perforation'there.- in communicating'with the said socket, a transparent Y scale removablyV positioned within the said socket and lying inwardly of the said perforation, engaging means for the said scale carried vby a wall of the said socket and .the'said perforation having an sof inner oblique guiding edge inclined toward the adjacentedge of the said scale.

5. A drafting instrument having an edge socket therein having one inwardly inclined retaining end, f the said instrument being provided with a receiving perforation in one face thereof communicatingY with` the said socket, a projection within the said socket opposite the said perforation, a transparent scale having one end thereof conformingjtoandbeing in engagement with j l the said retaining` end of the socket when the scale is operatively positioned inthe latter, the said scale being provided with'a recess adjacent its opposite end adapted for theremovable' reception of the said; projecy tion. 1 Y

6. A transparent drafting instrument provided with a socket in its operative straight edge, a scale removably positionable withinl the said socket, one edge of the scale adapted for inter-engagement with the adjacent end of the socket, disengageable connections at theopposite end of the scale, and guidthe said vlast-Iiainedend of the scale.

`In testimony whereof afliX my signature witnesses. l RUFUS B. ALLYN. f

Witnesses: v

ELEANOR T. WALMSLEY, Y

ROBERT Krimi'.

Copies of thisfpatent may be obtained for five cents each, addressingthe Commissioner 'of Patents. Washington,` I). G.k v 

